http://hdl.handle.net/10563/1001719 Wed, 08 Apr 2026 18:45:56 GMT 2026-04-08T18:45:56Z http://hdl.handle.net/10563/1012688 Scalability and performance study of an innovative battery based on electric-circuit models Reisz, Petra Alexendra; Maggauer, Klara; Fei, Haojie; Jamatia, Thaiskang; Pechancová, Viera In this article, we present a performance study and benchmarking approach for low technology readiness level (TRL) batteries, based on an interpretation of circuit-based battery model parameters. We show that when these parameters are tailored to the underlying cell, they can be a predictor of battery efficiency and dissipated power losses under different operating conditions and state of charge. We then consider electrical circuit parameters in a typical use case scenario (i.e. with a typical charge/discharge rate and battery cell capacity). It is then shown how in this scenario the expected efficiency and power losses can be forecasted. We additionally derive a forecast for the scaling of the battery parameters with its coulombic capacity, and validate this by comparing the results of pulse discharge measurements from two commercial lithium iron phosphate batteries with different capacities. Finally, we use our new methodology to predict the performance of a particular low TRL battery. The example which is taken in this article is a cell which uses a solid-state electrolyte made from bacterial cellulose, and is developed in scope of the EU project TwinVECTOR. It is currently being produced and developed on laboratory scale at the Tomas Bata University in Zlín. Wed, 01 Jan 2025 00:00:00 GMT http://hdl.handle.net/10563/1012688 2025-01-01T00:00:00Z http://hdl.handle.net/10563/1012620 Investigation of covalent binding of gold nanoparticles to chitosan nanofibers using cellulose and hyaluronate dialdehydes Münster, Lukáš; Důbravová, Alžběta; Hrbáček, Vítek; Muchová, Markéta; Kuřitka, Ivo; Humpolíček, Petr; Vícha, Jan In this study, the reaction mechanisms of gold nanoparticles (AuNPs) synthesis using dialdehyde cellulose (DAC) and dialdehyde hyaluronate (DAH), and their covalent binding to chitosan nanofibers (CHITs), was investigated. The synthesis uses a redox reaction where dialdehyde polysaccharides are oxidized to dicarboxy polysaccharides and the gold salt precursor is reduced to elemental gold. The formation of the AuNPs-CHIT composite involves Schiff base chemistry, where reactive aldehyde groups of the polysaccharide shell around AuNPs react with chitosan's amine groups, forming pH-labile imine groups, which can be subsequently stabilized using reductive amination. FT-IR and XPS analyses were used to confirm the proposed reaction mechanisms. Next, the catalytic activity of AuNPs synthesized using DAC and DAH was evaluated for the reduction of 4-nitrophenol to 4-aminophenol with sodium borohydride. Rapid conversion rates and high turnover frequency were observed. The morphology and structure of the composites were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). These analyses confirmed the sub-10 nm size of the AuNPs and their uniform distribution on chitosan nanofibers. The findings confirm the proposed reaction mechanisms, showcase the morphology and catalytic activity of the prepared nanoparticles and highlight their potential industrial applications. The versatility of this method also opens avenues for further functionalization and broader applications of AuNPs in biomedical fields such as biosensors and drug delivery systems. Wed, 01 Jan 2025 00:00:00 GMT http://hdl.handle.net/10563/1012620 2025-01-01T00:00:00Z http://hdl.handle.net/10563/1012110 How the rubber compounds of different tire's components heat up? Kratina, Ondřej; Stoček, Radek; Voldánová, Jana In general, there are more than a dozen different compounds used in the construction of a truck tire, whereas each compound used is formulated to optimize the overall tire performance, including heat generation. As a tire deflects, the hysteretic loss generated by all the compounds is the main source of heat build-up. Themoreatire deflects, the higher the hysteretic loss and the higher the heat build-up. This means that a tire that is overloaded or underinflated for the load its carrying will generate more heat. In addition, running at higher speeds or at higher ambient temperature will also increase heat build-up. Consequently, the increased tire temperatures in the individual parts are then one of the major causes of rubber degradation and can lead to fatigue cracking, belt separation, tread block tearing and chunking. Moreover, it can affect a tire's air permeability. Therefore, the aim of the current study is to investigate heat build-up of the real rubber compounds applied in to Multi-Purpose Tire (MPT). For that purpose, firstly the characterization of the fundamental mechanical behavior of these rubber compounds has been performed followed by systematic study of heat build-up inside and on the surface of the rubber test specimen during cyclic mechanical loading. Novel testing approach and fully instrumented facility labelled Heat Build-Up Analyzer (Coesfeld GmbH, Germany), which is based on multiaxial measuring capabilities such as dynamic multi-planar bending has been applied for the heat build-up characterization. Finally, the heat build-up properties of each rubber compound are discussed in relation to the relevant application in tire. Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/10563/1012110 2023-01-01T00:00:00Z http://hdl.handle.net/10563/1012096 Analytical calculation approach of heat-build up in rubber cylinder Peter, Ondřej; Stoček, Radek Since cyclic loading causes heat accumulation in the rubber parts due to a combination of mechanical energy dissipation and low thermal conductivity, it is necessary to be able to predict the temperature evolution in the rubber to avoid reducing its service life. In this paper, the analytical approach for calculating the steady-state temperature distribution throughout the cross section of the cylinder are derived. The results are verified by numerical simulation using the finite element method and their agreement is discussed. Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/10563/1012096 2023-01-01T00:00:00Z